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Description

An unused webshell in MicroServer allows unlimited login attempts, with sudo rights on certain files and directories. An attacker with admin access to MicroServer can gain limited shell access, enabling persistence through reverse shells, and the ability to modify or remove data stored in the file system.

PUBLISHED Reserved 2025-12-08 | Published 2026-01-07 | Updated 2026-01-07 | Assigner icscert




HIGH: 8.6CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 8.0CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-553 Command Shell in Externally Accessible Directory

Product status

Default status
unaffected

Any version before MS_4.1_14142
affected

Credits

UsrPacific/Columbia Weather Systems reported these vulnerabilities to CISA. finder

References

www.cisa.gov/news-events/ics-advisories/icsa-26-006-01

github.com/...p/csaf_files/OT/white/2026/icsa-26-006-01.json

cve.org (CVE-2025-66620)

nvd.nist.gov (CVE-2025-66620)

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